the sword is a typical ninjato (short sword used by shinobi) the idea is its like a Tsukumogami basically an object come to life (but i'm not going to give it tiny legs or any body parts) twice a week the sword will begin to leak water from the sword continuously until 1 liters of human blood (multiple samples of blood leading to one liter would be shown as more effective as to keeping it under control) is dripped onto the blade putting it back to an inactive state, however if the sword is not given the blood at about 2 hours the sword will begin to attract humans enticing them to grab its hilt causing the sword to become stuck to the subject possessing them. the human will enter an homicidal rage trying to kill anything around them. (they will be called SCP-xxxx-1 at this point

though if they cannot kill anything within about thirty minuets they will calm down in which the sword begins to speak through the wielder. (by this point they will be dubbed SCP-xxxx-2) I was thinking of the recovery of this thing going like this.

one day a monk was sitting by a rushing river when the glint of the swords edge caught their eye under the water. the monk fished it out of the river and brought it back to their temple. soon enough the sword starts to leak water. the head monk gives the order to perform rituals every day to soothe the swords rage by cutting themselves once a day each week whilst performing a cleansing ritual. of course word gets out to the foundation so they come and take the sword by force despite the monks warnings.

as for the swords back story its revealed in an interview log with SCP-xxxx-2 that they were a sword meant for a renowned shinobi however, there was a mix up. when making a sword usually two are made and the better one is chosen to be given. the sword was supposed to be the one given but the smiths apprentice sabotaged the shinobi by swapping out the sword for the inferior sword. at which point the words not worthy are carved into the blade by the apprentice as the other sword is given to the shinobi, only to have toe sword break during a mission. the shinobi gave up the smith since its their fault their weapon broke getting them caught.

the smith and apprentice were executed as the remaining weapons were tossed into a river where they stayed there for 100 years, most of the weapons had rusted or had been swept away by the current but the sword kept its shine developing a blue tint in the blade.

thats about all i got besides maybe making SCP-xxxx-2 remember the lives of past instances of SCP-xxxx amplifying the rage or something like that. go ahead and rip this apart i know there are probably like thirty other sword scp out there

Hi there, Magnus here, actual real life master swordsman! So, a few things to address before you draft.

Ninja-to were never actually shown to be used by ninja. It's mostly hearsay and fabrication. Ninja mostly used improvised weapons, and common objects which could double as weapons.

Where is this sword going to leak precisely? I don't know how much you know about swords, but there aren't any "gaps" in the blade usually.

I think you're buying in to the romanticism of ninja a bit much here. S'not really how ninja operated. There were two famous ninja clans, but a significant number of them were just Samurai who were out of work.

Steel (I assume this is a steel sword) can't develop a blue tint like that, naturally. It might be anomalous but it's gonna be difficult to do.

The entire concept is kinda…thing what make you fite good, but you can pull it off, if you reign back the ninja romanticism a bit, and ground it in science a bit more. The "leaking water" thing is definitely a bit…cheesy. I'm not sure if you're trying to tie in the legend of Murasame, but it's not gonna work well like this.

ah i wasnt trying to ninja romanticize, a few ninja carried swords where they could find them, most of the time their weapons were improvised even from the metal coins and what not, the leaking water bit was supposed to be leaked from the holes of the guard (kind of like tears?) anyways i know they arent what the movies say they are what i was trying to do is make a sword that was supposed to be made for someone who was supposed to assassinate a warlord and needed a sword to blend in as a guard (a katana may have made more sense but i digress) the short sword was supposed to be favored for quick deployment unlike a katana. the whole blue tint thing was just something i tossed in for the sake of adding something, perhaps i was going to go make it blue to mainly blend in easier at night, from what i know ninjas dont wear black and old japan (cant remember the details exactly) but the skys back then werent what they were like now so some kind of blue might have been better. wasnt quite sure what to use for the sword though i do not now much about metals